The first thing you should do is clean the level probes in the unit. There are two probes sticking through the back of the unit and the water completes a circuit between these two telling the machine when it is full. If they are clean, you may have a faulty sensor or wiring.

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The fill solenoid is behind the lower panel, attached to the left side of the booster tank. There is a screen in the end of the fill hose that may be clogged. You require 20 psi flow rate to run the machine properly.
Pull the top tray out, place a magnet on the door switch, with the door closed and monitor the 3 led lights on the control board while its filling. All 3 should light up. Use caution around the high voltages present on the relay board and the booster contactor.
The probes in the right rear corner of the tank send the water level signals to the control board. The tips must be clean of scale or debris that may signal that water is present, when it is not.

Does it fill? You should be able to hear it fill and then see water in the bottom of the tub when you open the door. If it is not filling it is one thing, if it is not spraying it is another issue. Let me know

ck. flow press. of water , when fill solenoid opens press. should be @20 p.s.i because this is a time fill machine. this is important .not static press. flow press. also ck the screened washers in the fill hose to see if they are plugged .let me know what you find so i can futher assist. dont forget to vote tks

this are the possibilities for the leak :-----Door gasket loose/tornCorner gaskets or door baffle/vent gasketDoor lock/latch loose/brokenSplit spray armOver filling with water...usually the level is just under the heating element is normalSomething leaking through the door...like the soap or rinse agent dispenser gasket, silverware basket button.Door hinge(s) bentWrong soap was used...dish sink soap instead of dishwasher soapRinse aid being used with mechanically softened water ( makes foam or suds inside the dishwasher )

Leaks from under the unit:Look for whiting or calcium stain on the motor and pump assembly = motor and pump assembly seal leak...access panel removal helpHose for upper spray arm splitFill hose split or fill hose spout air inlet is calcium coveredDrain hose is splitRusted liner...metal liners onlyFill valve leaking or allowing water to fill all the timeHeating element ends....where they come out through the dishwasher linerFloat or float gasket.

Joe - The main issue is that the builtin booster heater is full of water - it has to be drained - there may be a small drain plug (square-shaped head), if not, you may have to pull loose the heater element to drain the tank. I would pour antifreeze solution in there and also in the wash tank. Unhook the water inlet - you say the machine is hard-plumbed in but mfgr recommends using brauided water hose to connect to water supply. hopefully this helps - I service commercial machines and came across your question and maybe you can ansqwer one of mine - how do I cancel the "delime" indicator? I can't find operators manual. jimmy.